Values for Calulating Motor Sizing

I "think" (bad, I know) I have an idea of the motor size I need for a
BP retrofit but would like to calc it out to see. I have read
numerous archives, especially the infamous # 45509 from Mariss. That
is very useful. However, I don't have a good feeling for the input
values of IPM and Lbs.

What would be a low/med/high IPM for a CNC milling operation? I will
be mosting doing aluminum with some steel. What IPM is slow, fast,
etc. I'm shooting in the dark at this point.

What is a good Lbs value? Is this suppose to represent the weight of
the table or force required to move the table while cutting, or
both? I'm not a mechanical engineer, or any other type, so I need a
little help in what values I should be using in the motor sizing
calcualtions.

Mark